Armature for magneto machines



I J. R. STARK. 'ARM'ATURE FOR MAGNETO MACHINES. 1 APPLICATION FILED AUG-25, 1920. RENEWED NOV. 25,.192 1,422,145.

I Peitented July 11, 1922.

UNITED STATES PATENT OFFICE.

JOHN ROY STARK, or rmomn, WISCONSIN... AssmNon T0 wnns'mn, nnnc'iimcj, ooMPAu-Y', or nAcm-E, WISCONSIN, A GOBPORATION on WISCONSIN.

AVRMATURE FOR MAGNETQ, MACHI ES.

Specification of Letterszlatcnt.

Patented Julylll, 1922.

Application filed. August 25,1920, Serial No. 405,958. Renewed November 25', 1921. Serial No. SEEM.

To all? whom it may concern:

Belt known that I, JoHnRoY STARK, a

citizen of the United States, andresident' of Racine, in the county'of Racine and State of lVisconsin, have invented a certain new and useful Improvement in-Armatures' for Magneto l\ [acl1ines ,,'of which the following sion of an extremely sturdy, compact, and

efficient armature structure for magneto machines and contemplates the provision of such an armature which is. so arranged that the several parts thereof may be very easily assembled and rigidly held together by "means of a minimum number of rivets or other equivalent fasten ng devices.

While my invention is illustrated in the accompanying drawings as applied to that type of magneto generally known as a high tension oscillating ignition magneto, the features of novelty, wherewith my invention is concerned, may be incorporated in the armatures of various other types and kinds of magneto machines. v

In the accompanying drawings illustrating my invention,

Figure 1 illustrates an oscillating high tension ignition magneto, the armature of which is constructed in accordance with my invention, this view illustrating certain parts in section and others in elevation, and

Figure 2 1s a partially disassembled View in perspective of certa n parts of the armature structure.

Similar characters of reference refer to similar parts throughout.

The magneto shown, comprises the field of the apparatus just mentioned are generally well known and these parts maybe of any suitable construction although I prefer that said parts of the apparatus shall consubstantiallyLshaped soft'iron laminae 9-9- and a pair of steel bars 10--10. The bars 10 10'are disposed on opposite sides of the lamina 9 9 and parallel therewith,- atten tion being directed to the fact that the said bars 10 -10 are of substantially the same length as the laminae and have-their arcuate ends struck on the same radius as the ends of the laminae with the result that when the core structure is assembled as show-ninFigure '1, the arcuate ends of bars 1O-'-10 lie flush with the arcuate' ends of the laminae. The several parts-of the core structure just mentioned are preferably rigidly secured to getlier by a plurality ofrivets11-+11 which pass through" the bars 10 10 and through segmental steel blocks 12-12 and 13-43, the

arcuate surfaces of these blocks being struck 'on the same radius as are the ends of the laminae 9"9 and lie flush therewith when the armature structure is assembled as shown Each of the blocks 12-12 and in Figure 1. 13-13 is provided on the side thereof next- 14r-1 1thatis of such size and shape'that the block may snugly embrace the adjacent end of its associated armature core bar 10. By virtue of this arrangement, I am enabled to secureboth of thebars 12 and 13 associated with each end of the core structure rigidly in position by the use of a single rivet 15 which rivet extends through registering apertures in the blocks 12 and 13, the bars 10--10 and the laminae 9-9. It will thus be seen that I am enabled rigidly to secure all of the segmental blocks 1212 and 13'13 in position by means of only two rivets, whereas in the conventional armature structure, it is necessary to employ at least four and often times as many as six or eight rivets to accomplish this purpose. The aradjacentthe core structure with a notch may be of brass or other suitable material rangement shown has been found to be very satisfactory and generally more desirable than the conventional armature construction because of the fact that it is stronger and because of the further fact that the armature structure or" my invention may be manufactured at less cost than can the conventional armature construction.

At the ends of the armature structure are provided the disks l6 and 17, each of which and is secured to the adjacent pair of segmental blocks 12-12, or 1313, by screws 18-18. The disks are fixed to the armature trunnions 1919 which are carried in suitable bearings provided by the ends of the.

housing l. It will be noted that the disk 16 carries the movable elements of the interrupter mechanismwhile disk 17 carries the spool 20 which, in the arrangement shown, is provided with the collector ring 21. It the armature of my invention is used in a rotary ignition magneto tor a multiple 'cylinder engine, the spool 20 would, of .course, be provided with a suitable distributor segment and that distributor segment would co-operate with a plurality of brushes electrically connected with the spark plugs in the several cylinders of the engine, in a well known manner. The spool 20 is conveniently held in driven relation to disk 17 by being provided with a pair of driving studs which project through apertures 22-22 in'the disk 17 and are held therein by suitable spring clips, all as shown and described in my co pending application. Serial No. 405,957.

The-primary and secondary windings and 23 are diagrammatically shown in Figure 1. The usual condenser indicated at 2 L is carried in the space between the wind-.

The several electrical- 1. An armature tor a magneto machine comprising a core structure consisting of a group of substantially I-shaped laminae and a pair of bars, one disposed on each side of the laminae and rigidly secured thereto, seg mental blocks disposed at the ends of the core structure and provided with notches whereby the blocks may embrace said bars, and means extending through the blocks and through the core structure arranged to hold the blocks upon the core structure.

An armature for a magneto machine comprising a core structure consisting of a group of substantially I-shaped laminae and a bar disposed at one side oi said lamina: and rigidly secured thereto, segmental blocks disposed immediately adjacent the ends of said laminae and provided with notches whereby the blocks may embrace the bar, each block being secured to the core structure by a single fastening means extending through the block and core structure.

' 3. An armature for a magneto machine comprising a core structure consisting 0] a group of substantially I-shaped laminae having segmental ends, a bar disposed at one side of the laminae and rigidly secured thereto, said bar being of the same length as the laminae and provided with arcuate ends arranged to lie flush with the ends oi the laminae, together with segmental blocks disposed at the ends of the core structure with their arcuate faces flush with the ends 01'' the laminae and of the said bar, there being notches in said blocks whereby they may embrace the bar and lie against the laminae and rivets for securing the segmental blocks to the core structure.

4L. An armature for a magneto machine comprising a group of substantially I-shaped laminae having segmental ends and segmental blocks disposed adjacent the ends of the laminae with their arcuate tacos flush with the ends of the laminae together with means for securing each of the blocks to the laminae consisting of a bar of less width than the ends of the laminae and rigidly cured thereto, the bar being received in a notch in the block, together with a single rivet, passing through the block and laminae and holding said parts together.

In witness whereof, I hereunto subscribe my name this 5th day o'li' August. 1920.

7 JOHN ROY STARK. lVitnesses (T. OEI-IORT, P. Cnnwn. 

